Improved device for making electro-magnetic currents, constant or intermittent



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flfyidi M. MARSHALL.

Electric Machine.

Patented Aug. 9, 1859.

* UNITED STATES PATENT OFFICE.

MOSES MARSHALL, OF LOIVELL, MASSACHUSETTS.

IMPROVED DEVICE FOR MAKING ELECTED-MAGNETIC CURRENTS, CONSTANT 0R INTERMITTENT.

Specification forming part of Letters Patent No. 25,023, dated August 9, 18:39.

To all whom it may concern:

Be it known that I, MosEs MARsEALL, of Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented a new and useful Magneto-Electric Machine for eurin g or ameliorating diseased persons, particularly those affected with nervous complaints and I hereby declare that the following specification, in connection with the accompanying drawings and references thereon, constitute a lucid, clear, and exact description of the construction and use of the same.

In referring to the said drawings, Figure 1 denotes a plan or top view,with case open; Fig. 2, a front elevation of the same, with portions of the front broken out to show parts beyond; Fig. 3, a transverse and vertical section on line A B of Fig. 1, and showing parts beyond 5 Fig. 4, alongitudinal and vertical section on line 0 D of Fig. 1, and showing parts beyond.

The nature of my invention consists in obtaining both the single and double electric current in the same machine, and changing itfrom the double to the single or from the single to the double, in the manner hereinafter seen.

To enable persons skilled in the art to which myinvention appertains to construct and carry out the same, I will describe it, as follows:

1 construct a case of wood (seen at A) for containing the main parts of my invention. To this case, which forms the insulator, is secured, by nuts L and M, two sets of brass bearings, (seen at B and (3,) the former receiving the armature-shaft E and the latter the drive-shaft F, on which is fixed the drive-band wheel G, which, when turned by crank H, revolves the armature-shaft and the two helices V and W with great velocity by means of band I operating in grooves a and b of the drive-wheel G and armature-shaft E and friction binder or spring J, which, by its elasticity or sprin g-pressure, by means of its pulley K, keeps the band 1 always of the required tension, and at the same time allows it to yield to the inequalities of the grooves a and b in pulleys E and G, which drive and is driven by the band I.

The magnet is constructed in the usual manner, and is seen at Q, and is guided, positioned, and held to the case A by the stops P, between it and the side of the boXA and the cross-bar N, which, by means of screw 0, presses the magnet firmly and holds it against the stops P and case A.

I construct a keeper, (seen at 1%,) and, by its pivot c, it is fitted to hole form ed in the case A, so as to freely turn or swing therein, it being also free to move transversely and be held in its place, as seen in the drawings, by the attraction of the magnet, and thereby relieve the magnet ofa portion of its power, the purpose of which is well known. The upper end of this keeper is disconnected from one fork of the magnet by drawing the rod S, which is connected to the upper end of the keeper, out of the case A, when it imparts more power than it it were in position seen in the drawings, which is well known.

The parts thus far described form no part of my invention, and are only described to show fully the application of it 5 and, asbefore stated, the purpose of m yin vention is to obtain the sin gle and double electric currents and to change them from one to the other in the manner described.

I will now proceed to describe my invention, or what is new, and the parts immediately connected therewith.-

I construct a stand, (seen at T,) which is drilled and reamed its entire length and th readed to receive a screw, 0, in one end, by which it is firmly secured to the case A, as shown in the drawings, while the other end receives the insulator f, in which is secured the spring g, which must always rest and press upon the circular portion of the armature-shaft E, but not the flattened portion. The end of this spring 9 is split edgewise for a very little way at its inner end, and one of these split parts is bent down and the other up, as seen at it, so as to readily alloweither pron g j of the forked plunger ito come in'contact with it when moved thereto by knob U or otherwise. This plunger 2 is split, and each of its prongs j are sprung outward, so as to press against the surface of the hole in stand T when inserted therein, the object of this spring or pressure being to retain the plunger t in any desired position after being slid by the knob U.

The standT is slotted on each opposite side at the end nearest the magnet, to receive and hold springs k and Z, the former of which con stantly rests and presses elastically upon the metallic ring m, which is fitted to, carried by,

and insulated from, the armature-shaft E by non'conducting substance n, and the spring I is so placed as to come in contact with the circular portion only of the armature-shaft. The flattened portions A and B leave and revolve under the spring Z, and which causes two breaks in the electric current to each revolution of the armature-shaft E.

The armature-shaft E is flattened, as seen at A on one of its sides, from ring at to where the shaft begins to taper, and also on the opposite side of this shaft (seen at B for about one-half the distance of flattened place A, as seen at Fig. 3, that the spring g may ride on the periphery of the armature-shaft E'with but one break to a revolution, while the spring I has two breaks to a revolution, by reason of leaving that portion of the periphery or circular part of armature-shaft E, which is slabbed or flattened on two opposite sides, as seen at A and B.

The helices V and W are carried by arms extending from and forming part of cross-bar X,- which projects from the shaft E. One helix- Wire is connected to the insulated ring m and the other to the armature-shaft E.

A stand (seen at Y) is secured to the end of the box or case A by screw r. This stand is connected to the armature-shaft E by wire Z. The screws 6 and r are drilled and threaded to receive the snaps A and A the ends of which a-rethreaded and split to be sprung into the threaded holes in the screws 0 and a, when desired. These snaps terminate with an eye at the outer end, to which cords B and .0 are connected, and thence to 'handles' D and E,

which are held by the patient being operated upon.

Operation: In order to use my magneto-electric machine, the handles D and E are held by the hand or otherwise placed to form a connection with the invalid, and then turn the crank H, which revolves the helicesV and W,

which charges them or receives the electricity from the magnet and disperses it through the connection and person being operated upon;

and to obtain the single current or continued flow of electricity in one direction, the knobU is pressed inward or moved so that the plunger t will come in contact with the spring g; and 1 to obtain the double or to-and-fro current, draw back the knob U so as to disconnect the prongs j of plungeri from the spring, which leaves the springginsulated and which leaves the helix- Wires connected only with the springs l and 70.

I claim- The spring g, so constructed and arranged as to be insulated from or connected to the two ends of the helical wires by springsl and k or otherwise, essentially in the manner and for the purposes fully set forth.

MOSES MARSHALL.

Witnesses E. 'W. Soo'rr, ABIEL PEVEY. 

